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Biodegradable polyurethane materials from bark and starch. II. Coating material for controlled‐release fertilizer
Author(s) -
Ge Jinjie,
Wu Rui,
Shi Xinghai,
Yu Hao,
Wang Min,
Li Wenjun
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.11211
Subject(s) - polyurethane , coating , materials science , polyester , fertilizer , starch , composite material , nuclear chemistry , chemistry , organic chemistry
Biodegradable polyurethane foams (PUFs) as coating materials for the controlled release of fertilizer were prepared from a four‐component system consisting of diisocyanate, polyester, Acacia mearnsi bark, and corn starch. Ammonium sulfate [(NH 4 ) 2 SO 4 ] was used as a fertilizer to evaluate the effects of the preparation conditions on the release ratio. The release ratio of (NH 4 ) 2 SO 4 decreased with an increasing amount of biomass in PUFs and increasing sizes of sample particles; the ratio increased with increasing doses of water, which was used as a foaming agent in the preparation of polyurethane, regardless of the amount of coating material. The remaining fertilizer in the polyurethane seemed to be released completely because the PUFs were degradable, to some extent, by soil microorganisms. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2948–2952, 2002